When to drop to one nap?

[FebMama]

Just that really. When did others notice their LO's drop to one nap per day?

@VillageFete current wake windows are around 3-4 hours. About 4 sometimes 4.5 between lunchtime and bedtime.

Finding it hard to drop to one nap at the mo, LO has come down poorly so is suddenly sleeping a lot more and as and when he wants to, which is fine given he's under the weather. Will tackle the one nap transition when he's feeling more himself for sure!!